Abstract
Off-diagonal coupling matrix elements have been calculated between vibrational levels of the C 2Σ + and the D 2Σ + states of HeH, using published potential energy curves and radial coupling matrix elements. The theoretical off-diagonal matrix element between ν= 0 of D 2Σ + and ν=3 of C 2Σ + is 39 cm −1, which is comparable to a reported experimental value of 43.4 cm −1.
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